Photo with reference verticals drawn - blue line is at center of top radius of headstock.
GUILD and Chesterfield appear aligned to each other, but Chesterfield is noticeably closer
to D tuner than the G tuner...
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Take a look at page 17 of the Guild Guitar Book, 2nd headstock from the right.
Offset so far to the left it's kinda shocking. Botton of the rooftop's virtually touching the "D" tuner and is
well clear of the "G"
(Had a chance to look at it last night, and also confirmed D35's
did have inlaid rooftop logos when introduced with D25's in '68, and got silkscreen logos later on, but no mention of a chesterfield through '77.
Which doesn't necessarily mean it
didn't happen.
Right now I'm thinking somebody had some parts lying around and put something together.
A student of luthiery, maybe, practicing with parts that weren't particularly valuable at the time?
But I think it really did start as a Guild neck, that flat heel's just way too uncommon and I wouldn't expect somebody to go the trouble of replicating it, and setting a neck on a body isn't a job for an amateur.
Maybe it needed a truss replaced thus the Gibson-type nut? Fretboard'd have to come off for that, maybe coincidentally creating an opportunity to install custom overlay?
Bonneville, since you seem to have access to photos, 2 details might confirm if it's a "real" Guild neck:
The heel should not be stacked, and headstock is also of one piece with the neck.
In any case I think our new new member's getting a mid-level course in what kinds of details help confirm the authenticity of a Guild.
Like Bobuoz said, evidence of a laminated top on a flat-top acoustic almost absolutely rules it out as a Guild.
(I say "almost" because there may still be a surprise out there I've forgotten or never knew about)
And yes all the Guild interior workmanship I've ever seen is also immaculate or pretty damn close.